Structural electrodes of anhydrous RuO2 vertical nanorods encased in hydrous RuO2 have been prepared via chemical vapor deposition (CVD) followed by electrochemical deposition. The composite structures are studied using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The capacitive properties are measured using cyclic voltammetry and impedance spectroscopy. In a miniaturized configuration, the CVD grown structure provides a connecting backbone of electron paths and open channels for ion migration to facilitate the charge delivery or acceptance from the electrodeposited hydrous RuO2 of high pseudocapacitance. The sample of thermally reduced nanorods encased in RuO2·0.46H2O (RuRuO2VR-H2) exhibits a total capacitance of ∼520 F g-1 (870 mF cm-2) at 5 mV s-1, superior to that of the RuO2·0.46H2O coated as-grown nanorods (RuO2VR-H) ∼260 F g-1 (300 mF cm-2). Despite having twice the charge storage capability, RuRuO2VR-H2 demonstrates a capacitor response time similar to that of RuO2VR-H because of its low internal resistance. Two important features of RuRuO2VR-H2 are identified, including an open structure for hydrous RuO2 accommodation and a fast electron path for charge delivery and retrieval.

No abstract

Inhibitor is a substance that is added to the corrosive media to inhibit corrosion rate. Organic inhibitors are preferred to inorganic ones since they are environmentally friendly. One of the organic compounds which is rarely reported as a corrosion inhibitor isMyrmecodia Pendans. The organic compounds can be adsorbed on the metal surface and block the active surface to reduce the rate of corrosion. In this study, the used pipe was carbon steel API 5L Grade B with 3.5% NaCl solution as the corrosion medium. The objective of this research was to analyze the inhibition mechanismMyrmecodia Pendanstowards carbon steel in a corrosion medium. Concentration variations of extractMyrmecodia Pendanswere 0–500 ppm. Fourier Transform Infrared (FTIR) was used for chemical characterization ofMyrmecodia Pendans. Polarization and Electrochemical Impedance Spectroscopy (EIS) were used to measure the corrosion rate and behaviour. From the electrochemical measurements, it was found that the addition of 400 mg/L inhibitor gave the highest inhibition efficiency.Myrmecodia Pendansacted as a corrosion inhibitor by forming a thin layer on the metal surface.

No abstract

No abstract